Number indicator for telephone substations



NUMBER INDICATOR FOR TELEPHONE SUBSTATIONS Filed June 12, 1945 4 Sheets-Sheet 1 Fig.1

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AL /always Nov. 29, 1949 o. MOSER NUMBER INDICATOR FOR TELEPHONE SUBSTATIONS 4 Sheets-Sheet 2 Filed June 12, 1945 /77 wwa/ w QMMQ M Uffa M016) Nov. 29, 1949 o. MOSER 2,48 ,6 9 I NUMBER INDICATOR FOR TELEPHONE SUBSTATIONS Filed June 12, 1945 4 Sheets-Sheet 3 0% Mode) Nov. 29, 1949 o. MOSER NUMBER iNDICATOR FOR TELEPHONE SUBSTATIONS 4 Sheets-Sheet 4 Filed June 12, 1945 05/0 Ma a Patented Nov. 29, 1949 NUMBER INDICATOR FOR TELEPHONE SUB STATIONS Otto Moser, Berne, Switzerland :ApplicationJune 1 2, 1945, Serial No. 599,010

In Switzerland June 12, 1944 7 Claims.

The present invention relates to a number indlcator' in trunk call stations operating with selector dials, and particularlytelephone stations, where number rollers are worked in conjunction with the numbers dialed by means of an electromagnet under the influence of the dialing current impulses, with the help of pawls and ratchets, of which 'oneisallotted to each number roller in such away-that each number can be read ofi immediately after dialing. The invention consists in an arrangement whereby, for the switching over of the current from one number-roller tothenext, a second electromagnet which serves as commutation magnet is provided, which comes into action at the close of a series of impulses and operating controlwheels, one of which in each case brings the pawl allotted to the number roller to be'dialed into gearwith the corresponding ratchet, whilst the-other pawls"-allotted '-to the number rollers whicharenot-to be dialed are raised by the corresponding 'ratchets. The control wheels are so arranged that all pawls come into action one after the other. Each pawl-has a-special control wheel which contains a hollow intended to receive a pin connected with the pawl, the pawl being brought intogearwith'the corresponding ratchet, when'the pin-is laid in the hollow, and being raised by' the ratchet'an'dthus put out of action when'the pin'is laid on the ratchet rim. All-control wheels are set on a shaft which is driven by the commutation magnet with the help of a pawl-and aratchet, and are arranged in such a way that the hollows are displaced by each other, whereby at=the same time :only the pin which is in contact .with the pawl of the particular number roller to be dialed can enter the hollow, sothat onlyone pawl comes into action at one time. The-exciting coil of the transmission magnet for the number rollers is connected upwith a ,circuit which is sporadically interrupted by'the impulsecontact of thenumber switch in suchzawayflthat it issubject to the influence of the dialing current impulses. The exciting coil.of'thecommutation.magnet lies in a circuit .under the influence of-the short circuit contact of :the number :switch, so that it always comes into action :at the close of a series of impulses .and causesthe drive to be-switched over from one numberroller to thenext.

The vcircuit of the commutation ,magnet .is best interrupted when .the .number indicator is at-restby aclosedmcircuitworking contact under the, influencerofrthe. first number roller, which is so arranged that the commutation magnet can ing the receiver.

onlyreceive current when the first number roller has turned by at least one division. In one specific embodiment of ,the invention, the re,- versal of number rollers and control wheelscan be effected simultaneouslyby means of a reverse key. Means can also be installed to achieve this reversal automatically on hanging uporr eplac- For .this purpose, a reversal magnet is provided, theeXciting coil of which isconnected with acircuit under the influence of the hook commutation switch. Itis advisable to arrange, parallel to the working side of the hook commutation contact serving to close the station loop, a working ocontact which is dependent upon the control wheels and which maintains the loop circuit ,for'the reversal magnet until the reversal of the-number rollers and contr w e ls .is' c mill e Two specific embodiments of the number indicator for telephone connections constituting the present inventionhre described below with referenceto the accompanying drawings:

' Fig. l is a longitudinal section of the number indicator,

.Fig. 2 represents the commutation mechanism for the control wheels,

Fig. 3 shows the reversal mechanism of these control wheels,

Fig. 4 shows the connection of the electromagnets with various control organs,

Fig. 5 is a view of the control wheels,

Fig. 6 shows the arrangement of the number rollers, I

Fig. '7 is a switch arrangement of a telephone station with a number indicator according to the invention, the reversal being carried out by hand,

Fig. 8 is a switch arrangement of a station with an automatically rev'ersing number indicator. l

Both types of construction differ only in so far as the one is equipped'for reversal by hand and the other for automatic reversal. They are therefore similarin the essential points and described together.

'I'heorgans of the dialing, commutation and reversal mechanism-are arranged between two side-plates I held together by separation column 2 and enclosed in a frame 3--show-n only in partwith windows 4. Number rollers 6, of which there are in this particular case nine, being'adapted to the longestnumber to be dialed, aremounted on a common shaft 1 so that they can revolve freely, and are provided for dialing purposes with one ratchet 8 each and. for re- 3 versal purposes with a heart-shaped lug 9. Ratchet B is adapted to be engaged by a pawl l and a stop-pawl II. All pawls H) are rotatably mounted on a common bar |2, which in its turn is fixed to a U-shaped transmission bar i3 (Figs. 1 and 2). Transmission bar |3 is connected by means of a strap M with armature I5 of an electromagnet I6 serving as transmission magnet and said transmission bar I3 is rotatably mounted on shaft H, the ends of which are let into side-plates All pawls H] are therefore set in motion simultaneously by armature |5. Each pawl possesses a longitudinal opening which receives a pin fixed in a guide hoop I9. In the same guide hoop IS a further pin 2| is provided which either moves into a hollow 23 in a control wheel 22 or rests on its rim according to whether the pawl H] is to be brought into or out of gear with ratchet 8. In Fig. 1 pawl I0 is in gear with ratchet 8. Guide hoop H) has horseshoe-shaped parts connecting it with the hub of control wheel 22. Moreover a hole is bored in the bridge of the hoop into which a pin screw 25 screwed into a guide rail 24 projects, which also serves to guide hoop H). To each pawl is allotted one of these guide hoops l9 with pins 20 and 2| and one control wheel 22 as can be seen from Fig. 1. All control wheels are set on a common shaft 26 fixed in side-plates I which likewise carries a ratchet 2? (Fig. 2). Control wheels 22 are so arranged that hollows 23 are adjusted towards each other. In this way one pin 2| lies at one time in a hollow, i. e. only one pawl ||l is ingear with the corresponding ratchet. junction with ratchet 21 (Fig. 2), this being fixed on a rotating commutation hoop 29 on shaft ll. The longitudinal part 29' of this hoop has an arm 29" (Fig. 4), which is connected by means of a strap 30 with the armature 3| of an electromagnet 32 serving as commutation magnet. Two bars 33, of which only one is to be seen in Fig. 3, are rigidly connected with commutation hoop 29 by means of screw springs 34 and are arranged one on each side of the apparatus. At their upper ends these bars 33 contain longitudinal holes 35, through which a lever rod 36 extending under all pawls l0 protrudes. This is best let into the longitudinal holes in side-plates l which are similar to those of bars 33. A reversal hoop 31, which is very well seen in Fig. 4, is rotatably mounted on shaft l1 and serves to reverse both number rollers 6 and control wheels 22. Rigidly connected to this reversal hoop by means of two further screw springs 38 are two release bars 39, similar to release bars 33, the upper ends of which are pierced by lever rod which fits into the longitudinal holes. Release bar 39 seen in Figs. 1 and 2 has a cam 39" which extends to a point close to a further cam 28 on a pawl 28 and the bent end 40' of a lever 40 which is mechanically connected to stop-pawl 4| of ratchet 21 (Fig. 2). Moreover both release bars 39 are each fitted with a cam 39, which can operate a common release bar 35a for all stop-pawls ll of the number rollers, as is particularly well shown in Fig. 1. This release bar works in conjunction with cams H attached to stop-pawls Reversal hoop 31 is fitted with extensions 31' which work in conjunction with a comb-shaped reversal member 42 screwed on the inner surface of side-plates I. This reversal member contains reversal points 42' which come into contact with the heart-.- shaped lugs 9 of number rollers 6 for reversing A pawl 28 works in con- 4 the latter. Reversal hoop 31 also has a lug 31 which works in conjunction with a lug 43, likewise heart-shaped, which is rigidly fixed on control wheel shaft 26 and serves to reverse control wheels 22 (Figs. 3-5). When it is required that reversal should be effected by hand, the reversal hoop is also fitted with a stop 31a, which is under the influence of press-button 44a of a press-key 44 fastened to one of the side-plates l, which key is held when at rest by a spring 5. When automatic reversal is required the reversal hoop 3-1 is fitted with a special arm 31b which is connected by means of a strap 46 with the armature 45 of an electromagnet 41 serving as reversal magnet. The latter lies next to the other magnets l6 and 32. The general structure of the arrangement described is such that its components can be constructed uniformly, quite independent of whether the reversal takes place by hand or automatically. It can be fitted, according to requirements, with key 44 or with reversal magnet 4'! or, if necessary, with both organs together. The first number roller 6 is fitted with a cam 6a which operates a working contact 49 by means of a pin 48 (Fig. 2). A further working contact 50 is under the influence of a control wheel shaft 26 through the intermediary of a drive 5| and a pin 52. (Fig. 3). The purpose of these contacts is explained by means of Figs. 7 and 8.

Fig. 7 applies to the design with manual reversal and represents the switch-system of a telephone subscribers station equipped with a number indicator as described. This comprises, as usual, a set of fittings (Ga) consisting of the telephone T, the microphone M and the induction coil Ind, including the number switch with the impulse contact 1' or short circuit contact is, respectively and the call circuit with condenser K0 and alarm Wk. The exciting coil of the transmission magnet l6 for the number rollers of the number indicator lies in a circuit which is sporadically interrupted by impulse contact 2' of the number switch, which circuit is produced by the working side of short-circuit contact k developed as an alternating circuit. The exciting coil of commutation magnet 32 lies in a circuit closed by working contact 49 controlled by the first number roller 6, which circuit is in turn produced by the passive side of short-circuit contact is. The hook commutator I-IU serves as usual to close the station loop a, b and to cut out call circuit K0, Wk.

The switch system according to Fig. 8 differs from the preceding system in that reversal magnet 4! and contact 59 are added. The exciting coil of the former is connected, like that of commutation magnet 32 by means of a second contact HUII of the hook commutator with contact 49. The contact 59 lies parallel to the working side of hook contact HUI serving to close the loop circuit a, b and to switch oil the call circuit.

The arrangement described functions as follows: As can be seen from Figs. '7 and. 8, the station loop between terminals a and b is closed by taking up the receiver, 1. e. by changing over hook commutation contact HU or HUI. Upon dialing the number disc contact 70 is changed over whereby transmission magnet l6 of the number indicator is operated and the talking appliance Ga of the station is short-circuited. Armature |5 in Fig. l is attracted and transmission hoop I3 is swung to the left with the assistance of strap |4. Hoop l3 takes with it all the pawls l0,

.armatures from the magnetic poles by the pole area divided by 81r. Since the flux density is dependent upon the ampere turns and core material by increasing the ampere turns sufificient power has been developedto operate this mechanism of few moving parts. In addition, by keeping the air gap between the poles and the armatures to a minimum, the maximum efllciency of the electromagnets has been utilized.

I claim:

1. A number indicator for trunk call stations operating with automatic dials and havin a number switch having a short circuit contact, said indicator comprising a pluralit of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls oif said ratchets, a commutator electromagnet, a circuit connected with said commutator electromagnet, means connected with said circuit and the short-circuit contact of the number switch to energize said circuit in each case at the end of a series of impulses and to cause the switching over of the driving current from one number roller to the neXt, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said con- :trol wheels and actuated by said commutator :magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl :allotted to thenumber roller to be dialed into mesh with its ratchet, and means connected with said control wheels for actuating said pawls.

2. A number indicator for trunk call stations operating with automatic, dials, said indicator comprising a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls off said ratchets, a commutator electromagnet, a circuit connected with said commutator electromagnet, means connected with said circuit for interrupting the same when the indicator is at rest after the actuation of the first number roller, means connected with the exciting coil of said commutator electromagnet for transmitting current from said circuit thereto only after said first number roller has turned by at least one division, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, and means connected with said control wheels for actuating said pawls.

3. A number indicator for trunk call stations operating with automatic dials, said indicator comprisin a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to energize each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialin current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls off said ratchets, a commutator electromagnet, means energizing said commutator electromagnet after the energization of said transmission electromagnet and after each subsequent dialing, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raisin the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, means connected with said control wheels for actuating said pawls one after the other, whereby said number rollers assume positions after each dialing in which the numbers dialed can be read thereon, a backward key, and means connectin said backward key with said number rollers and control wheels for reversing the same.

4. A number indicator for trunk call stations operating with automatic dials and having a receiver, said indicator comprising a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls off said ratchets, a commutator electromagnet, means energizing said commutator electromagnet after the energization of said transmission electromagnet and after each subsequent dialing, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, means connected with said control wheels for actuating said pawls one after the other, whereb said number rollers assume positions after each dialing in which the numbers dialed can be read thereon, and means connected with said number rollers and control wheels for automatically reversing the same upon the hangin up of the receiver.

5. A number indicator for trunk call stations operating with automatic dials and having a receiver, and a hook commutator for said receiver, said indicator comprising a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls ofi said ratchets, a commutator electromagnet, means energizing said commutator electromagnet after the energization of said transmission electromagnet, and after each subsequent dialing, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, means connected with said control wheels for actuating said pawls one after the other, whereby said number rollers assume positions after each dialing in which the numbers dialed can be read thereon, a reversal magnet, means connecting said number rollers and. control wheels with said reversal magnet, and means connecting the exciting coil of said reversal magnet with said hook commutator, whereby said number rollers and said control wheels are automatically reversed.

6. A number indicator for trunk call stations operating with automatic dials and having a receiver and a hook commutator for said receiver, said indicator comprisin a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet, means connected with said transmission electromagnet for supplying a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls ofi said ratchets, a commutator electromagnet, means energizing said commutator electromagnet after the energization of said transmission electromagnet, and after each subsequent dialing, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, means connected with said control wheels for actuating said pawls one after the other, whereby said number rollers assume positions after each dialing in which the numbers dialed can be read thereon, a reversal magnet having a loop circuit, and a working contact dependent on the control wheels running parallel to the working side of said hook commutator and maintaining said loop circuit until the reversal of the number rollers and control wheels is completed.

7. A number indicator for trunk call stations operating with automatic dials, said indicator comprising a plurality of number rollers, a separate ratchet rotatable along with each number roller, a separate pawl adapted to engage each ratchet, a transmission electromagnet of sufli- 10 cient ampere turns to be operated by system current, means connected with said transmission electromagnet for supplyin a dialing current thereto to energize the same, means connected with said pawls and actuated by said transmission electromagnet to raise some of said pawls off said ratchets, a commutator electromagnet of sufiicient ampere turns to be operated by system current, means energizing said commutator electromagnet after the energization of said transmission electromagnet and after each subsequent dialing, a separate control wheel for each pawl, means connecting said control wheels with said pawls, means connected with said control wheels and actuated by said commutator magnet for raising the pawls allotted to number rollers not to be dialed and bringing the pawl allotted to the number roller to be dialed into mesh with its ratchet, means connected with said control wheels for actuating said pawls one after the other, whereby said number rollers assume positions after each dialing in which the dialed numbers can be read thereon, said number indicator further comprising a reversal magnet of suflicient ampere turns to be operated by system current, said reversal magnet having a loop circuit and a working contact dependent on the control wheels running parallel to the working side of said hook commutator and maintaining said loop circuit until the reversal of the number rollers and control wheels is completed.

OTTO MOSER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,932,965 Greenberg Oct. 31, 1933 2,176,346 Hyman Oct. 17, 1939 2,217,523 Namenyi Oct. 8, 1940 FOREIGN PATENTS Number Country Date 260,392 Italy Sept. 18, 1928 521,472 Germany Mar. 26, 1931 862,049 France Feb. 25, 1941 

